Improvement in machines for dressing and punching slates



UNITED STATES PATENT OFFICE.

JULIUS JAEGER, OF TOMPKINSVILLE, NEV YORK.

IMPROVEMENT IN MACHINES FOR DRESSING AND PUNCHING `SLATES.

Specification forming part of Letters Patent No. 113,672, dated April11, 1871.

To all whom it 'may concern:

Be it known that I, J ULIUs JAEGER, of Tompkinsville, in the county ofRichmond and State of New York, have invented a new and Improved Machinefor Dressing and Punching Slate; and I do hereby declare the followingto be a full, clear, and exact description thereof. which will enablethose skilled in the art to make and use the same, reference being hadto the accompanying drawing, forming part of this specification, inwhich drawing- Figure l represents a plan or top view of this invention.Fig. 2 is a vertical section of the same, the line .r 0c, Fig. l,indicating the plane ot' section. Fig. 3 is a detached plan of one ot'the dies in a larger scale than the previous figures. Fig. 4 is alongitudinal vertical section of the same, the line y y, Fig. 3,indicating the plane of section.

Similar letters indicate corresponding parts.

This invention relates to a machine which is intended for cutting slabsof slate to the shape required for rooting purposes, and for punchingholes into said slabs, so that they can be nailed down upon the roof,the cutting and punching mechanism being operated sin'iultaneously byone and the same treadle, so that the whole operation can be performedwith rapidity. f

The cutting mechanism consists of two hinged knives, which can be set atany desired angle, and the slates are placed against gages, and held inposition by a spring attached to the lever which carries the punches.This lever, and also the punches and dies, are made movable, so that thepunching mechanism can be adjusted as may be required. The dies arepivoted to slides, which are adjustable in suitable slots in the mainframe, so that said dies can be readily brought in the requiredposition. The holes in the dies are countersunk, so as to producecountersunk holes in the slates.

The main frame is provided with two eXtensions, one to receive the roughslates and the other those which have been dressed and punched.

The treadle, which serves to operate the punching and cutting mechanism,is subjected to the action of a loaded lever, which carries the entiremechanism back to its position of rest, and the resistance of which doesnot increase when the treadle is depressed.

In the drawing, the letter A designates a frame, in the lower part ofwhich is secured a treadle, B, which connects, by a rod, a, with alever, C, and by another rod, b, with two knives, D, the rod b beingmade to divide in two branches, each of which connects with one of theknives. Said knives swing on pivots o, which are secured in bars E, towhich the stationary cutter-blades F are firmly secured.

The bars E are connected to the main frame at or near their inner endsby pivots c', Fig. 2, while their outer ends rest on segmental bracketsd, and `they are provided with slotted ears e, through the slots ofwhich extend setscrews j', so that said bars, together with the knivesand cutter-blades, can be adjusted at any desired angle toward eachother.

In order to prevent the cutter-blades from springing down in the middlethey are supported by projections g on the main frame. (See Fig. 1.)

By using two knives placed at an angle toward each other and operatedsimultaneously, the slates can be cut to the desired shape by oneoperation.

The slates to be dressed and punched are placed on a platform, E, on thetop of the frame A, and they are adjusted in the desired position bymeans of a front gage, L, and a side gage, fz', both of which areadjustable for slates of diii'erent sizes.

The platform E is provided with two eXten sions, H H', one to supportthe rough slates and the other those which have been dressed andpunched.

The lever @,which connects with the treadle B by the rod a, is made tobranch oit' in two arms, which are connected to each other by crossbarsj le, and the ends ot' which are pivoted to head-blocks l, which arefitted into slots m in the platform E, and are set in the desiredposition by clamping-screws n.

The cross-bar k forms the guide for heads 0, which carry the punches p,and which are adjustable on said cross-bar. These punches act inconjunction with dies r, which are connected by pivots s to slides t,tted into guide-slots u in-the platform E, and held in position by.

clamping-screws v, Fig. 4.

The diesera swing lon their pivots s, so that they can be readilybrought in the correct position to t the punches, and the pivots s areformed on the upper ends of the clampingscrews c, (see Fig. 4,) so thatby tightening said clamping-screws the dies andthe slides t are fastenedat the same time.

The holes in the dies are countersunk, (see Fig. 4,) and the slates areplaced thereon with their upper surfaces down. When the punch strikesthe slate the latter, being unsupported over 'the entire area of thehole in the die, cracks off in the direction of the dotted lines shownin Fig. 4; and it' the slate is turned right side up, the nail-holeappears countersunk, so as to allow' the head ot the nail to sink inflush with the surface of the slate.

To the crossbarj of the lever C is secured a spring, w, (see Fig. 2,)which is, by preference, made in the form ot' a spiral, and When thelever G comes down this spring presses upon the plate and retainsit1iirmly in position during the time the knives and the punches takeeffect. It the slates are not held down upon the cutter-blades theiredges are liable to break orf unevenor rugged.

With the treadle B is connected a lever, G, (see Fig. 2,) which swingson a pivot, a', and to the outer ends of which are secured Weights b',so that Whenever the treadle is released the entire mechanism is carriedback to its state of rest.

I prefer this loaded lever G to a spring, because the resistance of theWeight remains uniform, While the tension of the spring increases asVthe treadle'is depressed, and just at the time when the knives andpunches have to act the tension of the spring is unnecessarily large andthe power required for operating the machine must be needlesslyincreased.

By my machine Iam enabled to dress and punch slates With comparativelylittle power, and in a very short time, so that much expense is saved.

What I claim as new, and desire to secure by Letters Patent, is-

1. The two pairs of shears D D and F F, adjustable at their pivoted endsto the desired angle, and combined with the gage wl and treadle B,substantially as described, for the purpose specified.

2. The lever C, carrying the punches p, in combination with the knives DD and treadle B, substantially as set forth.

3. The dies r, being connected to slides t by' pivots s, and operatingin conjunction With thel punches p, substantially as describe-d.

4. The retaining-spring w on the punchinglever G, to hold the slatesdown upon the stationary cutter-blades during the operation oi'ycutting, substantially as described.

5. The arrangement of countersun'k holesin the dies r, to act inconjunction with the punches p, as described, so as to producecountersunk holes in the slates exposed to the action ot' said punches.

J ULIUS JAEGER.

Witnesses W. HAUFF, E. F. KAsTENHUBER.

